Rao Bhadra, Reddy Satti Narayana, Mujeeb Abdul, Mehta Kanchan, Saritha G
Professor, Department of Conservative Dentistry and Endodontics Saveetha Dental College, Chennai, Tamil Nadu, India.
Senior Lecturer, Department of Conservative Dentistry and Endodontics Lenora Dental College, Rajahmundry, Andhra Pradesh, India e-mail:
J Contemp Dent Pract. 2013 Nov 1;14(6):1036-8. doi: 10.5005/jp-journals-10024-1446.
To determine the shear bond strength of self-etch adhesive G-bond on pre-etched enamel.
Thirty caries free human mandibular premolars extracted for orthodontic purpose were used for the study. Occlusal surfaces of all the teeth were flattened with diamond bur and a silicon carbide paper was used for surface smoothening. The thirty samples were randomly grouped into three groups. Three different etch systems were used for the composite build up: group 1 (G-bond self-etch adhesive system), group 2 (G-bond) and group 3 (Adper single bond). Light cured was applied for 10 seconds with a LED unit for composite buildup on the occlusal surface of each tooth with 8 millimeters (mm) in diameter and 3 mm in thickness. The specimens in each group were tested in shear mode using a knife-edge testing apparatus in a universal testing machine across head speed of 1 mm/ minute. Shear bond strength values in Mpa were calculated from the peak load at failure divided by the specimen surface area. The mean shear bond strength of all the groups were calculated and statistical analysis was carried out using one-way Analysis of Variance (ANOVA).
The mean bond strength of group 1 is 15.5 Mpa, group 2 is 19.5 Mpa and group 3 is 20.1 Mpa. Statistical analysis was carried out between the groups using one-way ANOVA. Group 1 showed statistically significant lower bond strength when compared to groups 2 and 3. No statistical significant difference between groups 2 and 3 (p < 0.05).
Self-etch adhesive G-bond showed increase in shear bond strength on pre-etched enamel.
测定自酸蚀粘结剂G-bond在酸蚀预处理牙釉质上的剪切粘结强度。
选取30颗因正畸拔除的无龋人类下颌前磨牙用于本研究。所有牙齿的咬合面用金刚砂车针磨平，并用碳化硅砂纸进行表面光滑处理。30个样本随机分为三组。使用三种不同的酸蚀系统进行复合树脂充填：第1组（G-bond自酸蚀粘结系统），第2组（G-bond）和第3组（Adper单组分粘结剂）。使用LED固化灯对每颗牙齿咬合面直径8毫米（mm）、厚度3毫米的复合树脂进行10秒的光固化。每组样本在万能材料试验机上使用刃口测试装置以1毫米/分钟的横梁速度进行剪切模式测试。根据破坏时的峰值载荷除以样本表面积计算出以兆帕（Mpa）为单位的剪切粘结强度值。计算所有组的平均剪切粘结强度，并使用单因素方差分析（ANOVA）进行统计分析。
第1组的平均粘结强度为15.5 Mpa，第2组为19.5 Mpa，第3组为20.1 Mpa。使用单因素方差分析在各组之间进行统计分析。与第2组和第3组相比，第1组的粘结强度在统计学上显著较低。第2组和第3组之间无统计学显著差异（p < 0.05）。
自酸蚀粘结剂G-bond在酸蚀预处理牙釉质上的剪切粘结强度有所增加。
